> JapanHacked_
[Contained][Severity: Critical][Web app exploit]

Sen: unauthorized access to Hai Cheese! Photo

Sen Corporation, which runs the Hai Cheese! Photo service selling school and kindergarten photos, was accessed between 18:00 on 4 June and 09:00 on 5 June. It stopped the system, fixed a vulnerability and restarted on 8 June. Its report of 31 July said names, addresses and phone numbers of buyers and delivery recipients and the names of their schools or kindergartens leaked. It did not publish a count.

Disclosed

2026-06-05

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Started 2026-06-04
  2. Detected, Disclosed 2026-06-05
  3. 1 days

Attack or cause

Method
[Web app exploit]
Impact
[Data leak][Service outage]
Entry point
Web app

Data exposed or at risk

[Name][Postal address][Phone number][Education]

Services hit

Organizations involved

Open in organization search

Sources

  1. [1][Official]【お詫びとご報告】「はいチーズ！フォト」への不正アクセスによる個人情報漏えいについてSen
  2. [2][Official]【ご報告】「はいチーズ！フォト」への不正アクセスによる個人情報漏えいについてSen · 2026-07-31